Concrete admixture, mortar admixture and blended cement

Abstract

A concrete admixture or a mortar admixture which is obtained by mixing a silicate with an acid in the presence of water and then solidifying the mixture. It is preferable that the silicate is sodium silicate and the acid is a carboxylic acid. This admixture can improve a tensile strength of a concrete or a mortar. Since a concrete or a mortar containing the admixture, cement, an aggregate and water is high in tensile strength, it can advantageously be used in various concrete structures, concrete products or mortar products.

What is claimed is:  
     
         1 . A concrete admixture which is obtained by mixing a silicate with an acid in the presence of water and then solidifying the mixture.  
     
     
         2 . The concrete admixture as claimed in  claim 1 , wherein the silicate is sodium silicate.  
     
     
         3 . The concrete admixture as claimed in  claim 1 , wherein the acid is a carboxylic acid.  
     
     
         4 . The concrete admixture as claimed in  claim 1 , which is a powder or granules.  
     
     
         5 . A concrete admixture comprising a powder or granules containing a reaction product of a silicate and an acid.  
     
     
         6 . A process for producing a concrete admixture, which comprises mixing a silicate with an acid in an aqueous solution, and then removing water from the aqueous solution for solidification.  
     
     
         7 . A concrete comprising the concrete admixture as claimed in  claim 1 , cement, an aggregate and water.  
     
     
         8 . A process for constructing a concrete structure, which comprises placing a fluid concrete comprising cement, an aggregate, the concrete admixture as claimed in  claim 1  and water in a form, and curing the fluid concrete.  
     
     
         9 . The process for constructing the concrete structure as claimed in  claim 8 , wherein the concrete admixture is added to a fluid concrete comprising cement, an aggregate and water, and the blend is then placed in a form.  
     
     
         10 . A process for producing a concrete product, which comprises placing a fluid concrete comprising cement, an aggregate, the concrete admixture as claimed in  claim 1  and water in a form, and curing the fluid concrete.  
     
     
         11 . The process for producing the concrete product as claimed in  claim 10 , wherein the concrete admixture is added to a fluid concrete comprising cement, an aggregate and water, and the blend is then placed in a form.  
     
     
         12 . A mortar admixture which is obtained by mixing a silicate with an acid in the presence of water and then solidifying the mixture.  
     
     
         13 . A mortar admixture comprising a powder or granules containing a reaction product of a silicate and an acid.  
     
     
         14 . A process for producing a mortar admixture, which comprises mixing a silicate with an acid in an aqueous solution, and then removing water from the aqueous solution for solidification.  
     
     
         15 . A mortar comprising the mortar admixture as claimed in  claim 12 , cement, a fine aggregate and water.  
     
     
         16 . A process for producing a mortar product, which comprises molding a fluid mortar comprising cement, a fine aggregate, the mortar admixture as claimed in  claim 12  and water, and curing the fluid mortar.  
     
     
         17 . Blended cement which is obtained by blending cement with a powder or granules obtained by mixing a silicate with an acid in the presence of water and then solidifying the mixture.  
     
     
         18 . Blended cement which is obtained by blending cement with a powder or granules containing a reaction product of a silicate and an acid.  
     
     
         19 . The blended cement as claimed in  claim 17 , wherein the water content of the powder or the granules is 10% by weight or less.